import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        //二三七整除
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        if(num % 2 == 0){
            System.out.print(2 + " ");
        }
        if(num % 3 == 0){
            System.out.print(3 + " ");
        }
        if(num % 7 == 0){
            System.out.print(7 + " ");
        }
        if(num % 2 != 0 && num % 3 != 0 && num % 7 != 0){
            System.out.print("n");
        }
    }
}
